tframeviewer，thtmlviewer，和tframebrowser

代码说明：

TFrameViewer, ThtmlViewer, and TFrameBrowser The HTML component set consists of the ThtmlViewer, TFrameViewer, and TFrameBrowser components. All three are HTML document display components: ThtmlViewer The basic component. ThtmlViewer displays single (non-frame) documents. It also forms the basis for the other two components. TFrameViewer Displays both Frame and single HTML documents. TFrameViewer is oriented more for local disk file use. TFrameBrowser Also displays Frame and single HTML documents. However, TFrameBrower is oriented toward Internet style protocols and URL usage. Additional code and/or components are generally required to use TFrameBrowser. If you know that your appication will not be using Frames, you can save a fair amount of code overhead by using ThtmlViewer rather than one of the Frame components. Many operations are also simpler using ThtmlViewer. -TFrameViewer, ThtmlViewer, and TFrameBrowser The HTML component set consists of the ThtmlVie